Question about Rheem 40 GAL ELEC TALL Water Heater 6YR SC 82VH402

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I have a Rheem Steller natural gas hot water service. There is a continuous dribble of water from the pressure valve overflow, even when the heater is not heating. I have tried easing the valve a few times but the water continues to dribble (probably filling a cup in about one or two minutes). The pressure valve is a HT55 (AS1357-1) with 1400 kpa pressure and temperature of 99c. I want to change the valve. Do I turn it down to just the pilot light, turn off the water and just unscrew and then screw in the new valve? It appears a simple operation to undertake but I don't want to end up scalded because of not knowing what I am doing. Regards, Greg Boland

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Yes, Turn the knob on the gas valve to off. Turn off the incoming water line into the water heater. If you have a valve on the outlet turn it off too. Open the drain at the bottom of the heater to drain a little water from heater. You can then lift the lever on the temperature/pressusre relief valve to let a little air in to release the vacuum and let the tank drain. If the relief is in the side let it drain a bit longer so the water level is below the outlet. Be sure to re-install the down pipe on the relief valve on the new valve. You should drain the a few gallons of water at least once a year from your heater, and you should exercise your temperature relief valve once a year to be sure it will function. If your new valve leaks suspect your temperature control allowing the water to get too hot.

Posted on Oct 04, 2010

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You should be able to control hot water temperature by adjusting the thermostats. Either or both may have failed, causing heating to increase to the maximum. The "spitting" is caused by boiling water. Likewise, the pressure relief valve is operating as it should resulting in the overflow you observe. You need to get your heater serviced immediately!!

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I want to convert my rheem tankless eco150xlp3 to natural gas. There is a gas type chip that plugs into the main board as described in the install manual. Opened the burner and the orifice looks servo...


Sell it on ebay.

A simple chip change will not convert because the orifice for each gas is different, the gas control valve is different, NG and LP gas each burn at different temperatures and pressures... with propane having higher temps and pressures.

Don't buy tankless computers and expect trouble-free installation and water heating bliss afterwards.
Read the manual for maintenance requirements, and look at the parts sheet and ask yourself how such a complex machine will simply balance and monitor water flow, water pressure, incoming and outgoing water temperatures, gas pressures, vent pressures, gas quality, gas pressures, while connected to water, gas, venting and electric systems inside your home which each have innumerable problems on their own.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Install tank type heater for around $400 and live worry free.
Avoid Rheem products since they do not post service manuals.
http://waterheatertimer.org/Which-is-best-gas-water-heater.html

Gene
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Sep 25, 2013 | Rheem Tankless Hot Water Heater...

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1) Rheem does not post service manuals.
Call Rheem and ask why, since the other big manufacturers, AO Smith and Bradford White do post service manuals.

2) You need new propane gas control valve, and matching combustion parts to fit existing tank.
http://waterheatertimer.org/pdf/Rheem-Water-Heater-parts-catalog.pdf
http://waterheatertimer.org/images/IMG_1826-LP-burner-450.jpg

3) Rheem does not recommend changing gas type, especially from natural gas to LPG.
LPG is higher pressure, and burns much hotter and requires cast iron burner, unlike the lighter-weight metal used for Natural gas burner.
The manifold tube and thermocouple must match the gas control valve, and gas-type and have correct thread for propane.
The combustion chamber and heat transfer surface can also be heavier metal for propane heaters.

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1 Answer

Rtg74pvn2 rheem tankless water heater gas problem


1) You want the truth: Forget tankless.
There are many tankless water heaters with insoluble problems.
And endless problems.
Rheem knows it.

2) Do you really expect your home computer to work flawless after replacing motherboard?
Get your money back from Rheem, or get a full replacement.

3) OR fix water heater yourself today: Install tank-type gas water heater for $350 from local box store.
FYI: Do not buy Rheem, Richmond, Ruud, GE as these units from Rheem have problems that require service technicians.
Instead buy Whirlpool, American, State, Craftmaster, Reliance, Kenmore, as these units from AO Smith have fewer problems and can be repaired by homeowner using simple part replacement.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

4) Copy following link for troubleshoot resources, and possible manual for Rheem, Richmond, Paloma water heaters:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Oct 16, 2012 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

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Before calling service technician, open following link for Rheem troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

List of causes MIGHT include one of following:
Bad household circuit breaker that powers electronics, or loose wire inside outlet where tankless plugs in.
Tankless fuses and control board.
Water flow rate too low. Minimum .8 gallon required (depending on model)
Tankless inlet filter clogged.
Household aerators clogged at faucets.
Crossover at single-handled faucet
If installed, there can be crossover at mixing valve.
Faulty household check valve, including check valve on re-circulation system if that system is installed.
Restriction in household water line, such as clog at elbow.
Unequal pressure in household hot and cold lines, caused by restriction in hot line. When single-handled faucet turns on, the cold water pressure is higher so hot does not flow and tankless will not turn on.
Loose wire connection inside tankless.
Unit temperature set too high.
Unit temperature set too low.
Water temperature is very hot coming out of tap, so more cold is added, but that reduces amount of hot water flow, so tankless turns off because flow rate is too low.
On some tankless, if water is preheated by solar or other indirect source, the burner will not activate.
High mineral content in water > delime tankless yearly
Misaligned temperature sensor
Low gas pressure. Wrong type of gas. Undersized gas line.
Too many faucets on at same time.
Faulty tankless water valve. Water valve stuck.
Fluctuating household water pressure, for example MUD and PUD district water pressure problems or water well pressure.
Faulty household pressure reducing/regulating valve if installed.
Faulty household pressure tank, if installed -or- pressure tank needs to be installed.

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1 Answer

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http://www.greatergoods.com/store/energy-savers/tankless-water-heaters/rheem-rtg-74-dvn-natural-gas-tankless-water-heater/prod_386.html
manual above.
I professionally recommend that you get a Plumber/Gasfitter, to check this over, as this isn't usual, and I wonder if there are not "Other" problems too... with anything that uses Gas one has a responsibility to the entire family to have it professionally checked over, in my humble view..

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1 Answer

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1 Answer

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The hot water will not come on intermitently. I


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